3Com 10014299 manual Configure Annex G Data Interoperation, Configure PVC XOT switching

		Configure X.25 over Other Protocols 221
Table 268 Configure PVC XOT switching
	Operation	Command
	Add a PVC XOT route	x25 xot pvc pvc-number ip address
		interface type number
	Delete a PVC XOT route	undo x25 xot pvc pvc-number

5Configure Keepalive and xot-source attributes

Configure X.25 over Frame Relay (Annex G)

After the TCP link is established, TCP will not be easily cleared even if the link is disconnected. But after configuring Keepalive, the router will send checking packets in time to check the usability of the link. If it cannot get confirmation after sending out packets several times, it will consider the link failure and clear it automatically.

Table 269 Configure Keepalive and xot-source attributes

Operation	Command
Configure SVC Keepalive and	x25 switch svc x.121-address[ sub-dest
xot-source attributes	destination-address ] [ sub-source
	source-address ] xot ip-address1 [
	ip-address2 ] … [ ip-address6 ] [
	xot-option ]
Configure PVC Keepalive and	undo x25 switch svc x.121-address[
xot-source attributes	sub-destdestination-address ] [
	sub-source source-address] [ xot
	ip-address1 [ ip-address2 ] … [
	ip-address6 ] ] [ xot-option ]

Configure Annex G Data Interoperation

ANSI T1.617 Annex G defines how to transmit X.25 packets over Frame Relay DCLIs. With the integrated acknowledgement, retransmission and flow control mechanisms of X.25, Annex G DLCI can provide reliable transmission service, as well as interconnect X.25 networks via Frame Relay networks. Annex G is a stopgap between X.25 network and Frame Relay network, which can effectively protect the investment that the user has made.

This section covers how to make configurations so that Annex G DLCI can be used to transmit IP data. For the configurations of X.25 switching over Annex G DLCIs, refer to the subsequent section.

Table 270 Configure an Annex G DLCI

Operation	Command
Configure a Frame Relay interface	link-protocol fr
Configure an IP address for the interface	ip address { A.B.C.D } { A.B.C.D }
Configure a Frame Relay DLCI	fr dlci dlci-number
Configure the Frame Relay DLCI to be Annex	annexg { dce dte }
G DLCI
Map the Frame Relay address to the	fr map ip { A.B.C.D } {
destination IP address	dlci-number }

Annex G DLCI does not support IARP (Inverse Address Resolution Protocol), so the user should configure a static map between the destination IP address and the Frame Relay address.